The freezing point depression of a 0.1 m aqueous solution of a monobasic weak acid HA is 0.20°C.

The dissociation constant for the acid is

Given: kg mol, molality molarity

Question

The freezing point depression of a 0.1 m aqueous solution of a monobasic weak acid HA is 0.20°C.

The dissociation constant for the acid is

Given:  kg mol, molality  molarity

Canvas Classes · Accepted Answer

Step 1: Find van't Hoff factor

Step 2: Find degree of dissociation

For ,  (one molecule gives 2 ions)

Step 3: Calculate

Key Points to Remember:
-  gives , then  for 1:1 electrolyte
-  (Ostwald dilution law)

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